This dissertation particularly presents the principle of measuring high-temperature superconductor thin films\' microwave surface impedance with coplanar transmission line, builds the model of the testing cavity, simulates and analyzes this model.

The dielectric image Green s function method combined with point matching method was used to analyze and calculate the distributed capacitance and conductance of the multi conductor coplanar transmission lines on semiconducting substrate over 0～20 GHz.

A new type of coplanar transmission lines was presented, including step microshield coplanar waveguide (SMCPW), step microshield coplanar coupled line (SMCCL), and coplanar coupled step microshield line (CCSML), which are suitable for MMIC design.

By employing the semiempirical dispersion formula for coplanar transmission lines, the mode dispersion and Cerenkov radiative attenuation characteristics in the frequency domain over a terahertz range of coplanar striplines on thick LT GaAs substrate were analyzed.

Analysis of shielding effectiveness of rectangular cavity of loaded PCB with aperture by transmission line method;

Specific contact resistivities(e_c) were measured by transmission line method(TLM) and a lowest e_c of 1.

This paper studies a relationship between input impedance and average characteristic impedance (w), wavelength shorten factor(n) and equivalent diameter through analysis of input impedance date of 76m and 138m antenna and proposes a view on the reason for bigger error of input impedance using transmission line method and a correction method.

73×10-5Ω·cm2 measured by the transmission line method(TLM),is obtained through a preheating(350℃,13s) and annealing(400℃,5s)procedure.